Abstract
The sensitivity of the VEPP-2000 e + e − collider in the search for the rare decay η → e + e − has been studied. The inverse reaction e + e − → η is proposed for this search. We have analyzed a data sample with an integrated luminosity of 108 nb−1 collected with the SND detector in the center-of-mass energy range 520–580 MeV and found no background events for the reaction e + e − → η in the decay mode η → π0π0π0. In the absence of background, a sensitivity to B(η → e + e −) of 10−6 can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is higher than the current upper limit on B(η → e + e −) by a factor of 2.3.
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Achasov, M.N., Barnyakov, A.Y., Beloborodov, K.I. et al. On the search for the η → e + e − decay at the VEPP-2000 e + e − collider. Jetp Lett. 102, 266–270 (2015). https://doi.org/10.1134/S0021364015170026
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DOI: https://doi.org/10.1134/S0021364015170026